Crackers Don't Matter: The whole Superhero Crichton routine with the cape and the puke etc. is silly enough, but the moment that really gets me is after he strikes the pose (Saturday Night Fever ... with sword). Aeryn's deadpanned "We are going to die." just cracks me up.

Out of Their Minds: The classic that everyone remembers. The whole routine when John (in Aeryn) is checking out his new body and gets caught by Aeryn. "I'll break your legs, even if they are mine."

Do deleted scenes count? If so the best I think is from Crackers Don't Matter where Harvey is singing "50 bottles of beer on the wall" and comments that it's a good song since he knows exactly where it's going...

Of the stuff that was actually in the episodes... well.. Harvey triumphantly shouting "Go Fish!" in In To The Lion's Den... besides Harvey... the end of Scratch 'n' Sniff when John tries to start his story over again... Most of Cracker's Don't Matter... Ah so many great memories..